<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <input type="text">
    <select name="" id="">
        <option value="+"></option>
    </select>
    <input type="text">

    <script>
        // +
        // +++
        // +++++
        // +++++++

        // for (var i = 1; i <= 7; i += 2) {
        //     var html = ""
        //     for (var j = 1; j <= i; j++) {
        //         html += "+"
        //     }
        //     console.log(html)

        // }




    </script>
</body>

</html>